CN109153046A - It is cleaned by the ultrasonic lens of wave-passage excitation - Google Patents
It is cleaned by the ultrasonic lens of wave-passage excitation Download PDFInfo
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- CN109153046A CN109153046A CN201780031322.4A CN201780031322A CN109153046A CN 109153046 A CN109153046 A CN 109153046A CN 201780031322 A CN201780031322 A CN 201780031322A CN 109153046 A CN109153046 A CN 109153046A
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- 230000005284 excitation Effects 0.000 title description 19
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- 230000010363 phase shift Effects 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 12
- 230000008878 coupling Effects 0.000 claims description 9
- 238000010168 coupling process Methods 0.000 claims description 9
- 238000005859 coupling reaction Methods 0.000 claims description 9
- 238000004506 ultrasonic cleaning Methods 0.000 claims 8
- 238000004140 cleaning Methods 0.000 abstract description 14
- BVPWJMCABCPUQY-UHFFFAOYSA-N 4-amino-5-chloro-2-methoxy-N-[1-(phenylmethyl)-4-piperidinyl]benzamide Chemical compound COC1=CC(N)=C(Cl)C=C1C(=O)NC1CCN(CC=2C=CC=CC=2)CC1 BVPWJMCABCPUQY-UHFFFAOYSA-N 0.000 description 10
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- 238000002604 ultrasonography Methods 0.000 description 2
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- ORQBXQOJMQIAOY-UHFFFAOYSA-N nobelium Chemical compound [No] ORQBXQOJMQIAOY-UHFFFAOYSA-N 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
- B08B7/02—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by distortion, beating, or vibration of the surface to be cleaned
- B08B7/026—Using sound waves
- B08B7/028—Using ultrasounds
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0006—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 with means to keep optical surfaces clean, e.g. by preventing or removing dirt, stains, contamination, condensation
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- Optics & Photonics (AREA)
- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
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- Lens Barrels (AREA)
Abstract
Described example includes ultrasonic lens cleaning systems (150) and drive circuit (100) to use the four or more energy converter segments (102) for being mechanically coupled to lens (202) to carry out clean lens, wherein the drive circuit (100) is by phase shifted oscillations signal (AS, AC the machinery row ripple rotated to the energy converter segment (102) with the central axis generated around the lens (202)) is provided, so that the lens (202) vibration is to be used for improved ultrasonic clean.
Description
Technical field
It is related to lens cleaning systems on generally herein, and more specifically to the ultrasonic clean system with current sense
System.
Background technique
Lens are for a variety of optical systems, such as camera lens, light lens etc..In outdoor utility, specifically exist
In system based on vehicle, camera or light lens are subjected to environmental weather conditions, dust and clast and may stop or interfere
Pass through light transmissive other pollutants of lens.By the generally cleanings of lens or clearly optical path for being based on camera
System be desirable to promote appropriate imaging, and be desirable to promote expected areas to illuminate for light-source system.Outdoor prison
The position of control video camera and lighting system and illumination and camera system based on vehicle often is inconvenient to be cleaned manually, and
Therefore automatic lens cleaning systems are desirable.Ultrasonic clean uses electromechanical transducer, such as is attached to lens element or lens
The piezoelectric actuator of the bottom of cover board so that lens vibration and from lens surface remove clast.It in some cases, include transducing
The mechanical system of device and lens undergoes resonance, and shows the specific sky as the standing wave determined by its engineering properties and boundary condition
Between vibration mode.However, the standing wave excitation of dirty lens leads to the wavefront fixed in space, and lens are known as node area
Certain parts do not vibrate.Therefore, specifically at or near node area, cleaning validity is reduced.
Summary of the invention
Described example includes ultrasonic lens cleaning systems and drive circuit to use the idol for being mechanically coupled to lens
The four or more energy converter segments to keep count of carry out clean lens.Drive circuit provides phase shifted oscillations signal to described change
Energy device segment is to generate the machinery row ripple for surrounding the central axis of lens and rotating, so that lens vibration is to be used for improved ultrasound clearly
It is clean.Description using the method for multiple energy converter segment clean lens it includes the first oscillator signal is provided for being provided from described
Second oscillator signal of the first oscillator signal phase shift non-zero angle amplifies first and second oscillator signal, by first through putting
Big signal offer is provided to second group of energy converter segment through amplified signal to generate machine to first group of energy converter segment, and by second
Tool traveling wave is so that lens vibration.
Detailed description of the invention
Fig. 1 is the schematic diagram of ultrasonic lens cleaning systems, and it includes four segment energy converters arrangements and driver IC to provide
Phase shift transducer signal is to generate the machinery row ripple for surrounding the central axis of lens and rotating.
Fig. 2 is the partial side view in cross section of the camera lens sub-assembly of the ultrasonic lens cleaning systems comprising Fig. 1.
Fig. 3 be show in the system of Fig. 1 and 2 with lens be radially of the central axis spaced apart and lens periphery around
The local perspective view of four opened element of transducer angularly spaced from each other.
Fig. 4 is the perspective view for implementing the machinery row ripple curve graph of [1,1] mode wave-passage excitation in the system of Fig. 1 to 3.
Fig. 5 to 8 is the simplification top view of the traveling wave rotated in the system of Fig. 1 to 3 around the central axis of lens.
Fig. 9 is partial schematic diagram of the explanation for the example signal routing configuration of four segment transducer systems.
Figure 10 is partial schematic diagram of the explanation for another example signal routing configuration of four segment transducer systems.
Figure 11 is yet another embodiment signal routing of the explanation for the four segment transducer systems with polarization energy converter segment
The partial schematic diagram of configuration.
Figure 12 is the schematic diagram for illustrating the top view of eight element transducer systems.
Figure 13 is the perspective view for implementing the machinery row ripple curve graph of [2,1] mode wave-passage excitation in the system of Fig. 1 to 3.
Figure 14 is the simplification top view of the traveling wave rotated in the system of Fig. 1 to 3 around the central axis of lens.
Figure 15 is the perspective view for implementing the machinery row ripple curve graph of [1,2] mode wave-passage excitation in the system of Fig. 1 to 3.
Figure 16 is the simplification top view of the traveling wave rotated in the system of Fig. 1 to 3 and 15 around the central axis of lens.
Figure 17 is partial schematic diagram of the explanation for the example signal routing configuration of 16 segment transducer systems.
Figure 18 is partial schematic diagram of the explanation for another example signal routing configuration of 16 segment transducer systems.
Figure 19 is partial schematic diagram of the explanation for another example signal routing configuration of eight segment transducer systems.
Specific embodiment
In the drawings, same reference numbers throughout refer to similar elements, and various features are not drawn necessarily to scale.
Also, term " coupling " includes directly or indirectly electrically or mechanically connection or combinations thereof.For example, if first device couples
It is coupled to second device or with second device, then the connection can be via the direct of one or more intervention devices and connection
Electrical connection or indirectly electrical connection.Also, term " lens " includes the lens or covering camera of the part as camera lens system
The covering lens of lens system.
Referring to Fig. 1 to 3, ultrasonic lens cleaning systems 150 are illustrated, it includes driver IC (IC) 100 and occasionally
Several energy converter segments 102 are with clean lens 202.The embodiment of diagram includes NS energy converter segment of even number or element 102,
Lens 202 directly or indirectly are mechanically coupled to, wherein NS is greater than or equal to 4 even number.Individual transducings in this example
Device segment 102 and the central axis 201 of round lens 102 are radially spaced, and converter 102 around lens 202 periphery that
This is angularly spaced.As described further below, phase shifted oscillations signal AS and AC are provided and are changed by drive circuit 100
The machinery row ripple that energy device segment 102 is rotated with the central axis 201 generated around lens 202, so that the vibration of lens 202 is to obtain
Improved ultrasonic clean.Compared with the standing wave excitation by generating machinery row ripple to create the wavefront for surrounding lens surface propagation,
Drive circuit 100, system 150 and the method for description provide improved lens and clean solution.This framework promotes more complete
Lens cleaning.
Cleaning systems 150 in Fig. 1 to 3 include four segment energy converters arrangement (NS=4), wherein energy converter segment 102-1,
102-2,102-3 and 102-NS (102-4 in Fig. 3) are bent and extend through slightly less than 90 degree of individual angles.At one
In example, energy converter segment 102 is equally angularly spaced from around the periphery of lens 202, but can be used not in other examples
Deng spacing.Each individual segments 102 have radially inner side and outside such as to retouch further below for being connected to signal source
It states.Drive circuit 100 is the driver IC powered by battery or electric power source 104 in this example.Fig. 2 shows cameras
Lens assembly, it includes ultrasonic lens cleaning systems 150 and lens 202.The lens assembly includes to form mechanically coupling
Close the energy converter segment 102-1 to 102-NS so that cylinder or " ring " configuration that lens 202 vibrate.Lens 202 in Fig. 2
It is with curved upper portion or outer surface " flake " lens, as shown in Figure 2.In other examples, can be used flat lens 202 or
Lens with different shaped face.Fig. 3 shows the example with flat lens 202.Lens 202 in Fig. 2, which are installed to, has circle
In the cylindrical shell 204 of cylindrical internal spacer structures 206.
Ring piezoelectric transducer system 102 is placed between spacer 206 and the outer wall of shell 204.Any conjunction can be used
Suitable electromechanical transducer segment 102, such as PZT (piezoelectric transducer) or the other types of energy converter that mechanical lens load vibration can be made.
The other shapes and configuration of energy converter segment 102 and lens 202, such as round, ellipse, rectangle or other polygons can be used
Shape.In the example illustrated by Fig. 1 to 3,201 spaced radial of central axis of energy converter segment 102 and round lens 102
It opens, and energy converter segment 102 angularly spaced from each other is opened around the periphery of lens 202.Use the peripheral edge in lens 202
The O-ring 208 extended between the outer wall of shell 204 seals round lens sub-assembly to prevent water or clast from entering shell 204
Inside.In an example, shell 204 may be mounted to motor vehicles as the spare camera in rear portion or as front or laterally
Camera operation.In other examples, the sub-assembly may be mounted to building or lamppost, such as monitor camera application.
In other examples, the sub-assembly can be used for internal security monitoring system, such as in business or residential building.At one
In example, the second generally flat lens 210 are placed in the inner surface of spacer 206.The second lens 210 in Fig. 2
The optical path for being imaged by camera 212 along lens centre axis 201 is provided with fish eye lens 202.Individual transducers
Segment 102 includes the lead for being connected to the output 142 of the first multiplexer and the second multiplexer output 144.142 He of lead
144 openings 216 for extending through in the pedestal 214 of shell 204 are used to connect with driver IC 100 to receive outside and inside
Driver signal.The sectional view of Fig. 2 shows first transducer segment 102-1 and third energy converter segment in the configuration of four segments
The part of 102-3 and respectively associated lead 142-1,144-1 and 142-3,144-3.Generally, driver IC 100 mentions
For integer number NS group or pair the first and second leads with adapt to NS energy converter segment 102-1 ..., 102-NS.
Energy converter segment 102 is located to the lower periphery of docking lens 202, as shown in Figures 2 and 3.In other examples
In, with any intervention structure installation energy converter segment 102 mechanically to be coupled with lens 202.In use, specifically in room
In outer installation, the upper surface of lens 202 is subjected to the herein referred to as dust of pollutant, clast, water and other optical defects
The accumulation of object.Driver 100 receives input electric power, the electric supply or electric power source from electric supply or electric power source 104
Such as the battery of the battery voltage signal VB relative to reference mode is provided, the reference mode is, for example, to connect in an example
Ground node GND.Example driver IC 100 includes terminal 106 (for example, IC pin or liner) to receive from electric supply 104
Battery voltage signal VB, and include the ground terminal 108 for being connected to GND.Driver IC 100 includes power management circuitry
110, it receives battery voltage signal VB and provides one or more supply voltages (not shown) with the internal circuit to driver 100
It is powered.Also, IC 100 include terminal 112-1,112-2,112-3 ..., 112-NS and 114-1,114-2,114-
3 ..., 114-NS with for by multiplexer signal output be connected to lead 142-1,142-2,142-3 ..., 142-NS
And 144-1,144-2,144-3 ..., 144-NS to be to be delivered to energy converter segment 102 for driver signal.
Driver 100 provides one group of phase shifted oscillations signal to cause energy converter segment 102 to vibrate lens 202, to pass through
Cleaning around the machinery row ripple that lens axis 201 rotates and convenience or promotion lens 202 is provided.In an example, it drives
Device 100 provides phase shifted sinusoidal ultrasound drive signals with actuated transducer segment 102, and energy converter 102 is caused to use ultrasonic wave
Vibrate lens 202 mechanically to remove dust and/or water from the surface of lens 202.It can provide Non-sinusoidal Oscillations signal, such as
Square wave, triangular waveform or other waveform shapes.The lens 202 under the ultrasonic wave at or close to the frequency of system resonance frequencies
Mechanical oscillation or movement can promote the energy-efficient removal of water, dust and/or clast from lens 202.In an example, it drives
Dynamic device circuit 100 delivers at the resonance frequency of mechanical assemblies or close to the resonance frequency by phase shifted oscillations driving signal
To energy converter segment 102.Fixed drive signal frequency can be used, or frequency can be adjusted by drive circuit 100 to adapt to
Change with the time or usable different frequency are used to clean different types of clast from lens 202.Driver IC 100 is one
The change of the resonant mechanical frequency of associated lens system is tracked in a example, and closed-loop system is provided and is tieed up with using this information
It holds with time and the clean-up performance in changing environment condition.
Driver IC 100 includes signal generator 130 and phase-shift circuit 132 and the first amplifier 134-1 (AMP 1)
With the second amplifier 134-2 (AMP 2) to generate and provide phase shifted oscillations signal AS and AC to energy converter segment 102, to generate
The machinery row ripple rotated around the central axis 201 of lens 202.Any suitable amplifier circuit 134, such as power can be used
Operation amplifier circuit is designed to adapt to the frequency bandwidth and output signal of the signal VS provided by signal generator 130
It is required that properly to drive given energy converter segment 102.Signal generator circuit 130 generates first vibrated with nonzero frequency ω
Output signal VS.In some instances, frequencies omega is ultrasonic, for example, about 20kHz or higher, but is not these described examples
The strict demand of all embodiments.In some instances, signal generator 130 is the frequency being capable of providing from 1kHz to 3MHz
The analog circuit of the oscillation output signal VS with any suitable waveform shape in rate range, and can provide while including multiple
Frequency component is so as to simultaneously with multiple frequency excitations by the signal VS of driving energy converter 102.In an example, signal generator
Circuit 130 is pulse-width modulation circuit to provide square-wave output signal voltage waveform VS.In other examples, signal generator 116
Sine output voltage signal is provided.In other examples, signal generator 130 can provide triangle, sawtooth or other waveform shapes
Or combinations thereof.
Phase-shift circuit 132 is received the first output signal VS and generates the second output signal VC vibrated with nonzero frequency ω.
Second output signal VC is from the first output signal VS phase shift non-zero angle.In an example, signal generator circuit 130 generates
The first output signal VS of sine, is expressed as VS=K*sin (ω t), and phase-shift circuit 132 is provided and shifted from the first output signal VS
90 degree of the second output signal VC=K*cos (ω t).First amplifier 134-1 includes input to receive the first output signal VS,
It and include the first amplifier output 136 to generate first through amplified signal AS based on the first output signal VS.Second amplifier
134-2 includes input to receive the second output signal VC, and includes the second amplifier output 138 based on the first output signal VC
Second is generated through amplified signal AC.
Driver IC 100 passes through to as associated driver individually corresponding with energy converter segment 102
The connection for the IC terminal that signal output terminal is grouped to 112,114 is interfaced with energy converter segment.Individual drive signal is defeated
Out terminal to the first lead-out terminal 112 of the first side (for example, outside) comprising can be coupled to corresponding energy converter segment 102 and
It can be coupled to second output terminal 114 of second side (for example, inside) of corresponding energy converter segment 102.IC 100 may include
Additional output allows 112,114 the different number of energy converter segment 102 of the configuration driven of IC for different application, example
Such as NS=2,4,8,16.Drive circuit 100 also includes routing circuit 140, is delivered to the through amplified signal AS for first
One group of output terminal 112,114 and second group of output terminal 112,114 is delivered to generate machinery through amplified signal AC by second
Traveling wave is so that lens 202 vibrate.
Routing circuit 140 can be fixed interconnection system so that signal AS and AC are routed to specific output terminal 112,114.?
In other examples, configurable routing circuit 140 can be used to allow to reconfigure driver IC 100 for different application.?
In the example of Fig. 1, routing circuit 140 include NS multiplexer 141-1,141-2 of integer number, 141-3 ..., 141-
NS.Individual multiplexers 141 correspond to one in energy converter segment 102.Individual multiplexers 141 are in various examples
It is inputted comprising two or more multiplexers.In the example of fig. 1, the first multiplexing of individual multiplexers 141
Device input is coupled with the first amplifier output 136 to receive signal AS, and the input of the second multiplexer is defeated with the second amplifier
136 couplings are out to receive second through amplified signal AC.Individual multiplexers 141 have the first and second outputs, include first
Multiplexer output 142, is coupled to the first multiplexer output signal SO being delivered to corresponding energy converter segment 102
First (for example, external) side.Second multiplexer output 144 is coupled to pass the second multiplexer output signal SI
It is sent to second (for example, internal) side of corresponding energy converter segment 102.Multiplexer 141-1 to 141-NS is by corresponding outside
With internal signal SO-1, SO-2, SO-3 ..., SO-NS and SI-1, SI-2, SI-3 ..., SI-NS provides to respective transducer
Segment 102-1,102-2,102-3 ..., 102-NS, as shown in fig. 1.
The selection input of individual multiplexers 141 receives selection signal to be selected in input.In Fig. 1,
Two selection inputs receive selection signal P and SC respectively.In this example, using P input signal P-1, P-2, P-3 ..., P-
NS come select for correspond to energy converter segment 102-1,102-2, P-3 ..., the polarity of 102-NS, and SC input SC-1, SC-2,
SC-3 ..., SC-NS through amplification sinusoidal signal AS and mutually moved through amplification cosine signal AC between selected.Individual multichannels are multiple
It is operated with device 141 according to correspondence received selection signal P and SC to provide selected oscillator signal AS or AC to corresponding energy converter
Side in the first and second sides of segment 102.The other side of associated transducers segment may be coupled to reference voltage, such as
Constant voltage signal GND, or it is coupled to another oscillator signal.
Routing circuit 140 in Fig. 1 includes look-up table 126 (LUT) to be believed selection according to one or more configuration inputs
Number P and SC is provided to multiplexer 141.In some instances, driver IC include at least one configuration input terminal 116,
118 to allow to be configured for example, by external circuits such as host circuits 120.IC 100 in Fig. 1 includes four terminals 116
To receive binary coding input NS, with specified by the number to drive the output multi-channel multiplexer of NS energy converter segment 102
Mesh.Three input terminals 118 are provided to receive the binary coding ND signal for specifying the nodal diameter number for gained traveling wave.
NS input provides NS signal to look-up table 126 via line 122, and ND input provides ND signal to look-up table via line 124
126。
LUT 126 is encoded to provide P and SC signal to match according to the specified NS and ND value of host in an example
Multiplexer 140 is set, carrys out clean lens 202 to operate energy converter segment 102 to generate traveling wave.Multiplexing in Fig. 1
Device 141 allows to be selected based on P the and SC signal from look-up table 126 from sine wave AS or cosine wave AC.In other examples
In (for example, Fig. 9 being described below and 11), individual multiplexers 141 include the coupled with reference voltages such as such as GND
The input of three multiplexers.This allow the particular side externally and/or internally in energy converter segment side according to P and SC signal with through putting
Big sine wave signal AS, the selectivity through amplifying cosine signal AC or reference voltage GND interconnect, to establish the machinery of lens 202
Wave-passage excitation.In this regard, driver IC 100 can by host circuit 120 configure with based on energy converter segment number (NS) and
The number (ND) of nodal diameter implements a variety of different configurations.The configuration of multiplexer 141 is provided for energy converter segment 102
The polarity and selection of the electrode of every side or the sine of electrical connection or cosine waveform.In the case where PZT (piezoelectric transducer) segment 102,
Segment 102 is vibrated when applying periodic electrical signal, to separate the lens 202 of clast and mechanical couplings.Entire lens combination
Part will usually have one or more resonance frequencies determined by the engineering properties and boundary condition of all components, and signal generator
Circuit 130 is in some instances to provide sine wave VS for effective at or close to one frequencies omega in resonance point
High-efficiency cleaning.
In an example, look-up table 126 provides multiplexer selection signal to configure by individual multiplexers 141
The polarity (P) and sine/cosine signals (SC) of offer.The example that following table 1 shows these control signals, wherein AS and AC is just
String and the input of cosine amplitude, P and SC are control signal positions.SO and SI is inside and output signal from multiplexer 141
Output is to be determined by that will be motivated with being used for the clean traveling wave mode of lens.This example can be used in such as Fig. 1 and 5 to 11
The four segment systems shown.
Table 1
One example of the content of look-up table 126 is shown in table 2 for 16 segment systems, and wherein NS indicates the number of segment
Mesh and ND indicate the number of nodal diameter.
Table 2
Fig. 4 to 8 is seen also, the vibration of lens surface forms particular space wave mode, and phase shift signalling and AC and AS are (single
Solely or further combined with GND connection) apply the axis 201 that can be originated around lens 202 to the selectivity of energy converter segment electrode
The traveling wave of rotation.Fig. 4 shows example machinery row ripple curve graph 400, wherein implements [1,1] mode traveling wave in the system of Fig. 1 to 3 and swashs
It encourages, and Fig. 5 to 8 illustrates the traveling wave that the central axis 201 around lens 202 rotates.It is to be directed to that mode in these examples, which is specified,
Round traveling wave [ND, M] mode has ND nodal diameter and M nodal circle (including boundary), and wherein ND and M is greater than zero.Node
It is the briefly static point or line on lens arrangement, but wave-passage excitation causes node to rotate around lens axis 201.In Fig. 4
Example in, when around axis 201 from top 402 watch when traveling wave rotate in the clockwise direction.In addition, [1,1] mould herein
In formula example, individual node diameter 408 extends in the X-Y plane of instruction around Z-direction axis 201.Fig. 4 is illustrated positioned at X-
The wave-passage excitation of planar lens 202 (for example, as shown in Figure 3) in Y plane, and excitation causes the fortune of the Z-direction of lens 202
It is dynamic, there is positive Z-direction displacement maximum value 404 and negative Z direction to be displaced minimum value 406.Fig. 5 to 8 is provided in different time points along side
To the simplification view of the traveling wave of 402 rotations, Fig. 5 illustrates the initial case position of maximum value 404 and minimum value 406, intermediary
The individual node diameter 408 entered is between positive valve associated with maximum point 404 and smallest point 406 and negative valve in X at Y=0
Side upwardly extends.The time indicated in Fig. 6, mechanically actuated by energy converter segment 102-1 to 102-4 make lobe and point
404, rotation is 30 degree approximate on 402 in the clockwise direction for 406 position.Fig. 7 and 8 is respectively illustrated with additional 30 degree of increment edge sides
It is further rotated to 402, interior joint diameter 408 is positioned at X=0 in the Y direction in fig. 8.In operation, energy converter piece
The phase shifted sinusoidal excitation of section 102 causes the continuous rotation of the traveling wave mode around Z-direction lens axis 201.Such as institute in Fig. 5 to 8
Show, compared with its interior joint diameter is by the standing wave exciting technique remaining stationary, the rotation of node diameter 408 or traveling.Therefore, it drives
Device circuit 100 advantageously provides wave-passage excitation, wherein vibrated along the surface region of the lens 202 of node diameter 408 and because
This is cleaned.
Wave-passage excitation can be indicated with mathematical way.The displacement for clamping round lens 202 or other circular slabs can be by such as the following
Formula (1) indicates:
Wherein JnIt is the n-th Bessel function, InIt is the modified Bessel function of the first type, and n and m are mode index
Number, n=0,1,2..., m=1,2,3 ....Natural mode frequency is given by following equation (2):
Wherein R is the radius of circular slab, and T is its thickness, λnmIt is the root of Bessel function equation, D is lens material rigidity
(being determined by Young's modulus, Poisson's ratio etc.), and ρ is lens material density.Following formula is defined,
Equation (1) can simplify as shown in following equation (3):
The solution W of Children abused under resonance frequency omega is given by:
W1(r, θ, t)=ARn,m(r)cosnθcosωt,
W2(r, θ, t)=BRn,m(r)sinnθsin(ωt+α)
W3=W1+W2
Rearrange W3It generates:
α=0, and A=B are set, rewritable equation is following equation (4):
W3(r, θ, t)=ARn,m(r)cos(nθ-ωt) (4)
Equation (4), which is defined on positive direction θ, has angular velocity omega/n traveling wave.By making A=-B, the θ that is negative is reversed in direction
Direction.Energy converter segment 102 forms annulus shape in this example, so that light can pass through along the direction of axis 201 at center
Lens 202.Circular transducer structure or system are divided into L autonomous channel or segment (L-NS) in the case.This division can
It is completed and physically dividing energy converter or only dividing electrode, wherein individually energy converter segment is defined in activatable part
102.In this configuration, respective channel is by by Sl(l=1,2 ..., L) input that indicates drives.Relative to ND
The standing wave of [ND, 1] mode of a nodal diameter and 1 nodal circle (for example, boundary), angle wavelength is 2 π/ND.In wavelength
In span, field wave is carried out in two or more channels that even number can be used, and entire circle includes ND wavelength and use
At least 2ND channel.The standing wave of [ND, 1] mode can by partition the transducers into the 2ND channel with equal arc length degree and
Setting is inputted and is generated according to the following formula:
S2k-1=S0sin(ω0t),S2k=-S0sin(ω0T), k=1 ..., N.
Wherein ω0It is the resonance frequency of [ND, 1] mode.
Fig. 9 shows the example signal routing configuration for four segment transducer system 102-1 to 102-4.In the case,
It is sinusoidal and remaining through amplification to receive that corresponding multiplexer (only illustrating one for convenience) respectively contains input 136 and 138
String signal AS and AC, and include the third input for receiving reference voltage signal (for example, GND).Corresponding external signal (SO) is mentioned
It is supplied to the lateral electrode of corresponding energy converter segment 102, and provides corresponding internal signal (SI) to the inside for arriving energy converter segment 102
Electrode.In the example of Fig. 9, all internal signal SI are GND offers as the reference voltage.External signal as SO is conduct
AS for segment 102-1, the AC for segment the 102-2 ,-AS for segment 102-3 and the-AC for segment 102-4 and
It provides.This configures [1,1] the mode traveling wave that can be used to implement to illustrate in above-described Fig. 4 to 8.
Figure 10 illustrates another example signal routing configuration for implementing the traveling wave of Fig. 4 to 8 using four segment transducer systems.
In the case, reference voltage GND signal is provided to the inside of segment 102-2 and 102-3, and segment 102-1's and 102-4 is outer
Side is also connected to GND.It is connected to AS on the outside of the inside of segment 102-1 and segment 102-3, and the inside of segment 102-4 and letter
AC is connected on the outside of number 102-2.[1,1] mode traveling wave of Fig. 4 to 8 is realized in this configuration.
Figure 11 is shown to be matched for the yet another embodiment signal routing of the four segment transducer systems with polarization energy converter segment
It sets.[1,1] mode traveling wave of Fig. 4 to 8 is also implemented in this configuration.PZT (piezoelectric transducer) segment 102-1 to 102-4 is subjected in this example
High voltage polarization, wherein segment 102-1 and 102-4 polarizes on negative (-) direction and segment 102-2 and 102-3 forward direction is polarizing
(+).In this example, interior segments electrode is connected to by GND signal by multiplexer 141, and by connecting AC signal
It is connected to the outside of segment 102-2 and 102-4 and AS is signally attached to the outside of segment 102-1 and 102-3, to implement clockwise
Rotary traveling wave.
Figure 12 shows segment 102-1,102-2,102- that explanation has the periphery for being placed in round lens 202 (not shown)
3, the figure of the top view of eight element transducer systems of 102-4,102-5,102-6,102-7 and 102-8.Energy converter segment 102
Extended around lens perimeter with 45 degree of angular separation angle, θ in this example.
Referring to Figure 13 and 14, Figure 13 is the machinery for implementing [2,1] mode wave-passage excitation in the four segment systems of Fig. 1 to 3
The perspective view of traveling wave curve graph 1300, and Figure 14 shows the gained traveling wave of the rotation of central axis 201 around lens 202.[2,1]
Energy converter segment 102 can be used to create for mode traveling wave, wherein to be appointed as S1=S3=-S2=-S4 neighbouring to cause for input
Channel vibrates in the opposite direction, therefore creates traveling wave.As shown in figures 13 and 14, [2,1] mode traveling wave includes first and the
Two positive peak or maximum 404-1 and 404-2, and a pair of of minimum value 406-1 and 406-2.Also, incentive mode includes the first He
Second node diameter 408-1 and 408-2, are offset from one another 90 degree in X-Y plane.In other examples, as shown in fig. 13 that
[2,1] 8 segments as shown in figure 12 can be used to configure to implement for mode traveling wave.
Instead of wiring variation or in addition to being routed variation, the poll polarity of adjacent channel can replace, while using same
One input signal is for all channels to generate [ND, 1] mode standing-wave.In order to generate the traveling wave of [ND, the 1] mode of being used for, simultaneously
Two orthogonal [ND, 1] standing waves are generated, and the interaction of the orthogonal standing wave leads to traveling wave.The standing wave of [ND, 1] mode has 2 π/ND
Angle wavelength, and described two orthogonal modes rotate quarter-wave relative to each other, are pi/2 ND.Come using two groups of channels
Described two orthogonal modes are generated, wherein each individual sites generate one in orthogonal mode.Energy converter channel for a group
Angle of the spatial distribution relative to another group of rotation pi/2 ND.It is defeated to described two groups according to above-described equation (3)
Entering is sin (ω respectively0And cos (ω t)0t).A other group effectively generates [ND, 1] standing wave using at least 2ND channel.
The total number in channel is 4ND.Annulus is divided into the 4N channel with equal arc length degree in this example.4 adjacent channels
Segment can be used together with any number of 2ND segment 102, have and enclose the alternative excitation of extension in the circumference of lens 202
Parallel pattern.A other first group by sine wave drive and second group is driven by cosine wave.In a other group, to two neighbours
The polarity of the input in nearly channel (being angularly spaced apart from π/ND) is alternately, as described by following formula:
S4k-3=S0sin(ω0t)
S4k-2=S0cos(ω0t)
S4k-1=-S0sin(ω0t)
S4k=-S0cos(ω0T), k=1 ..., N
This example generates the traveling wave of [ND, the 1] mode of being used for, and wherein wavefront will be enclosed along direction 402 and be rotated about the axis.By inverse
Turn the polarity of the input in any one group and another group of holding is constant, direction of rotation can be reversed.
Technique described above may extend into higher [ND, M] mode, wherein M > 1.Possible example also starts from making first
The multiple small energy converter channels arranged with annulus energy converter or in a circular manner motivate [ND, M] mode standing-wave with motivate [ND,
1] mode.M concentric-ring transducer can be used to motivate [ND, M] mode, and set for what monocycle [ND, 1] mode was proposed
Meter then can be in the upper repetition of each of M ring to motivate [ND, M] traveling wave.For lens clean applications, the center pair of lens
In optical transmission be transparent and this constraint usually only leaving sufficient space installs a ring, especially in small diameter lenses
On 202.One option is using transparent energy converter 102.For example, piezopolymer.For opaque ceramic transducer
102, single ring architecture can be used.Although efficiency may be decreased, monocycle energy converter segment can motivate such as moulds such as [ND, 2] mode
Formula, on condition that input frequency is at or close to [ND, 2] resonance frequency.
Example [1,2] mode comprising single nodal diameter 408 and 2 nodal circle is illustrated referring to Figure 15 and 16, Figure 15
Traveling wave curve graph 1500.Same transducer architecture and incentives can be used for [1,1] mode, with by by frequency shift be [1,
2] upper resonance frequency of mode and in [1,2] mode excitation traveling wave.Figure 16 is shown with segment 102-1 to 102-4 to generate
The simplification top view of the four segment embodiments of [1,2] mode traveling wave shown in Figure 15.The traveling wave of this form include Figure 14 and
Narrow valve peak or maximum 404-1 and local maximum 404-2 shown in 15, also internal valve minimum value 406-1 and part are most
Small value 406-2.Lead to increased acceleration using an example with the wave-passage excitation of [1,2] mode illustrated by upper frequency
Degree (for example, the speed of vibration can increase), this is beneficial to promote to remove certain form of clast from actuated lens 202.
It sees also Figure 17 to 19, Figure 17 and illustrates another example signal routing configuration, in the case using with segment
The 16 segment transducer systems of 102-1 to 102-16, wherein individual segments deviation angle θ=22.5 degree.In this example, on a left side
The internal electrode of the energy converter segment 102 of side and the external electrode of the segment 102 on right side are connected to GND.Also, in lower left
The external connection of energy converter in quadrant is connected with the inside on the energy converter of upper right quadrant and is all connected to through amplifying cosine
Signal AC, and amplified sign signal AS and be connected in the connection of the outer transducer in lower-left quadrant and lower right quadrant
Interconnection piece.This configuration is provided to be configured for the traveling wave of NS=16 and ND=1.Figure 18 shows another 16 fragment instance, wherein NS=
16 and ND=4.Configuration in Figure 19 arranges 102-1 to 102-8 using the eight segment energy converters for NS=8 and ND=2.Herein
In the case of, there is the inside for being connected to GND in pairs of segment 102-1,102-8,102-4 and the 102-5 being diametrically opposed to one another, and
The outside of rest segment 102-2,102-3,102-6 and 102-7 are also grounded.Amplified sinusoidal signal AS and is connected to energy converter segment
The external electrode of 102-1 and 102-5, and it is connected to the internal electrode of segment 102-3 and 102-7.Connect through amplification cosine signal AC
It is connected to the internal electrode of segment 102-2 and 102-6, and is connected to the external electrode of segment 102-4 and 102-8, as shown.It is a variety of
Different interconnection schemes may be implemented in the fixed route circuit hardware of circuit 140, or looking into the system 150 for passing through Fig. 1 to 3
The configuration of table 126 is looked for implement.
Described system and method are promoted for the clean vibration of lens on generally whole lens surfaces,
Middle vibration peak is rotated according to the traveling wave established by drive circuit 100.Traveling wave is rotated to the surface for being attached to lens 202
Any clast introduces centrifugal force, this helps to push clast far from center, and wherein clean surface is most useful for exterior light to camera
212 optical transmission.The movement of wavefront also generates the shearing force along angle direction.This power is added to by lens material 202
Local buckling generate any shearing force.Increased shearing force also promotes the removal of certain type clasts.
It may modify in the embodiments described, and other embodiments are possible within the scope of the claims
's.
Claims (22)
1. a kind of ultrasonic cleaning system comprising:
NS energy converter segment of integer number is mechanically coupled to lens, and NS is the even-integer more than or equal to 4, individually
The energy converter segment be spaced apart with the central axis of the lens and the lens periphery around angularly in relation to one another
It is spaced apart；And
Drive circuit surrounds the central axis to provide phase shifted oscillations signal to the energy converter segment to generate
The machinery row ripple of rotation is so that the lens vibration.
2. ultrasonic cleaning system according to claim 1, wherein the energy converter segment is in the periphery of the lens
Surrounding is equally angularly spaced apart from.
3. ultrasonic cleaning system according to claim 1, wherein the drive circuit includes:
Signal generator circuit, to generate the first output signal in nonzero frequency oscillation；
Phase-shift circuit, to generate the second output signal in nonzero frequency oscillation, second output signal is from institute
State the first output signal phase shift non-zero angle；
First amplifier, it includes the input to receive first output signal and to based on the first output letter
Number generate first through amplified signal the first amplifier output；
Second amplifier, it includes the input to receive second output signal and to based on the first output letter
Number generate second through amplified signal the second amplifier output；
Routing circuit, to by described first through amplified signal be delivered to first group described in energy converter segment and by described second
Through amplified signal be delivered to second group described in energy converter segment to generate the machinery row ripple so that the lens vibration.
4. ultrasonic cleaning system according to claim 3, wherein the signal generator circuit generates first output
Signal is as the sinusoidal signal vibrated in the nonzero frequency.
5. ultrasonic cleaning system according to claim 4, wherein the routing circuit is multiple comprising NS multichannel of integer number
With device, a other multiplexer corresponds to one in the energy converter segment, a other multiplexer packet
Contain: being inputted with the first multiplexer of the first amplifier output coupling, the with the second amplifier output coupling
The input of two multiplexers is coupled to for the first multiplexer output signal to be delivered to the of the corresponding energy converter segment
First multiplexer of side exports, and is coupled to the second multiplexer output signal being delivered to the corresponding energy converter
Second multiplexer of second side of segment exports, and the input of the selection to receive selection signal；And
Wherein a other multiplexer is operated according to received selection signal to provide selected oscillator signal to institute
State the side in first side and second side of corresponding energy converter segment.
6. ultrasonic cleaning system according to claim 5, wherein the routing circuit includes look-up table with defeated according to configuring
Enter signal and provides the selection signal to the multiplexer.
7. ultrasonic cleaning system according to claim 5, wherein a other multiplexer includes and reference voltage
The third multiplexer of coupling inputs, and wherein a other multiplexer is operated according to the received selection signal
The side in first side and second side selected oscillator signal to be provided to the corresponding energy converter segment, and by institute
It is coupled to the reference voltage in the other side stated in first side and second side of corresponding energy converter segment.
8. ultrasonic cleaning system according to claim 3, wherein second output signal is from first output signal
90 degree of phase shift.
9. a kind of Integrated circuit IC to drive ultrasonic lens cleaner comprising:
Signal generator circuit, to generate the first output signal in nonzero frequency oscillation；
Phase-shift circuit, to generate the second output signal in nonzero frequency oscillation, second output signal is from institute
State the first output signal phase shift non-zero angle；
First amplifier, it includes the input to receive first output signal and to based on the first output letter
Number generate first through amplified signal the first amplifier output；
Second amplifier, it includes the input to receive second output signal and to based on the first output letter
Number generate second through amplified signal the second amplifier output；
Multiple driver signal output terminals pair, a other driver signal output terminal to comprising: can be coupled to machinery
Ground is coupled to the first lead-out terminal of correspondence one the first side in multiple energy converter segments of lens, and can be coupled to institute
State second output terminal of second side of corresponding energy converter segment；And
Routing circuit, to by described first through amplified signal be delivered to first group described in output terminal and described second is passed through
Amplified signal be delivered to second group described in output terminal to generate machinery row ripple so that the lens vibration.
10. IC according to claim 9 is used as wherein the signal generator circuit generates first output signal
The sinusoidal signal of the nonzero frequency oscillation.
11. IC according to claim 9, wherein the routing circuit includes NS multiplexer of integer number, individually
The multiplexer correspond to the driver signal output terminal centering a pair, a other multiplexer packet
Contain: being inputted with the first multiplexer of the first amplifier output coupling, the with the second amplifier output coupling
The input of two multiplexers is coupled to for the first multiplexer output signal to be delivered to the respective drivers signal output
First multiplexer of the first lead-out terminal of terminal pair exports, and is coupled to the second multiplexer output signal
It is delivered to the second multiplexer output of the second output terminal of the respective drivers signal output terminal pair, and
Selection to receive selection signal inputs；And
Wherein a other multiplexer is operated according to received selection signal to provide selected oscillator signal to institute
State one in first and second output terminal of respective drivers signal output terminal pair.
12. IC according to claim 11, wherein the routing circuit includes look-up table to be incited somebody to action according to configuration input signal
The selection signal is provided to the multiplexer.
13. IC according to claim 12 further comprises at least one configuration input terminal to incite somebody to action from external circuit
The configuration input signal is provided to the look-up table.
14. IC according to claim 11, wherein a other multiplexer includes the coupled with reference voltage
The input of three multiplexers, and wherein a other multiplexer according to the received selection signal operation with will selected by
Oscillator signal is selected to provide to one in first and second output terminal of the respective drivers signal output terminal pair,
And another in first and second output terminal of the respective drivers signal output terminal pair is coupled to described
Reference voltage.
15. IC according to claim 14, wherein the routing circuit includes look-up table to be incited somebody to action according to configuration input signal
The selection signal is provided to the multiplexer.
16. IC according to claim 15 further comprises at least one configuration input terminal to incite somebody to action from external circuit
The configuration input signal is provided to the look-up table.
17. IC according to claim 9, wherein second output signal is from described 90 degree of the phase shift of first output signal.
18. a kind of use is mechanically coupled to the method that multiple energy converter segments of lens clean the lens, the method packet
It includes:
The first signal vibrated in nonzero frequency is provided；
The second signal vibrated in the nonzero frequency is provided, second output signal is non-from the first output signal phase shift
Zero degree；
Amplify first signal to generate first through amplified signal；
Amplify the second signal to generate second through amplified signal；
Described first is provided through amplified signal to energy converter segment described in first group；And
Described second is provided to energy converter segment described in second group to generate machinery row ripple through amplified signal so that the lens
Vibration.
19. according to the method for claim 18, wherein first and second signal is sinusoidal.
20. further comprising according to the method for claim 19, that reference voltage is provided to energy converter described in third group
Segment.
21. further comprising according to the method for claim 18, that reference voltage is provided to energy converter described in third group
Segment.
22. according to the method for claim 18, wherein second output signal is from the first output signal phase shift 90
Degree.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US15/186,944 | 2016-06-20 | ||
| US15/186,944 US10071400B2 (en) | 2016-06-20 | 2016-06-20 | Ultrasonic lens cleaning with travelling wave excitation |
| PCT/US2017/038348 WO2017223094A1 (en) | 2016-06-20 | 2017-06-20 | Ultrasonic lens cleaning with travelling wave excitation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109153046A true CN109153046A (en) | 2019-01-04 |
Family
ID=60661288
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201780031322.4A Pending CN109153046A (en) | 2016-06-20 | 2017-06-20 | It is cleaned by the ultrasonic lens of wave-passage excitation |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US10071400B2 (en) |
| EP (1) | EP3471899A4 (en) |
| JP (1) | JP7096462B2 (en) |
| CN (1) | CN109153046A (en) |
| WO (1) | WO2017223094A1 (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP7096462B2 (en) | 2022-07-06 |
| WO2017223094A1 (en) | 2017-12-28 |
| EP3471899A4 (en) | 2019-05-22 |
| EP3471899A1 (en) | 2019-04-24 |
| US20170361360A1 (en) | 2017-12-21 |
| US10071400B2 (en) | 2018-09-11 |
| JP2019527130A (en) | 2019-09-26 |
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